Intaglio roll



Aug. 22, 1939. 01 T, AYE 2,170,560

INTAGLIO ROLL Filed March 25, 1957 Patented Aug. 22, 1939 UNITED STATES PATENT OFFICE 2,170,560 m'momo ROLL Application March 25,

6 Claims.

This invention relates to an intaglio roll for applying transverse strips of adhesive to a travelling sheet of paper. It is primarily designed to be used in carrying out the process of making 5 paper bags described in the patents of Howze Haskell Nos. 2,014,497 and 2,062,265.

The principal object to be accomplished by the invention is to lay upon the sheet of paper a transverse strip of adhesive of substantial thickness, so that, for instance, in making bags in accordance with the Haskell patents there will be a substantial body of adhesive on the parts of the paper which are folded against each other,

to form a perfect seal against the passage of gases.

An intaglio roll has to be scraped by a doctor blade to remove adhesive from the cylindrical surface of the roll, so that the only adhesive upon it will be that lying in the groove. The scraping of such a roll by the doctor blade is attended by the difiiculty that the blade, which is ordinarily a thin strip of spring steel parallel to the axis of the roll, will scoop out the adhesive from a 25 roove cut straight across the roll. This disadvantage is eliminated by the present invention, in accordance with which the blade is excluded from the groove while passing over it, by making the mutually contacting surface of the blade and the roll in such shape that, while they both extend in the same general direction, the blade cannot enter the groove The invention will be described with reference to several illustrative forms shown in the accompanying drawing, wherein:

Fig. l is a vertical section of an adhesive applying mechanism in accordance with this invention.

Fig. 2 is a front elevation of one same mechanism.

Fig. 3 is an elevational view of a portion of an intaglio roll showing one form of groove in accordance with the invention.

Fig. 4 is a section on the line 4-4 of Fig. 3.

Fig. 5 is an elevational view of a portion of an intaglio roll showing a different form of groove in accordance with the invention.

Fig. 6 is a section on the line 6-6 of Fig. 5, and

Figs. '7, 8 and 9 are fragmentary elevations of rolls showing three diiferent forms of groove.

- Referring first to Figs. 1 and 2, an intaglio roll 2 is mounted by journals 3 in .bearings, one of which is shown at 4 resting upon a pillar 5. The roll dips into an adhesive reservoir 6 kept partly full of adhesive 8. n the same pillar is a.

end of the 1937, Serial No. 132,909 (on. 91-51) bearing 9, which has its counterpart at the opposite end of the roll that does not appear in the drawing. The bearings 9 are for mounting a doctor blade II) which is clamped by a plate l2 and screws l3 upon a bar i4 having gudgeons I6 5 slidably journalled in the bearings 9. The bar H has at one end an ear l8 connected by a pin 20 to a pitman 22, the other end of which is connected to a pin 24 adjustably mounted in a slot 26 of a. worm wheel 28. The worm wheel 10 28 meshes with a worm 30 mounted on a shaft 32 journalled in a bearing 34. On the opposite end of shaft 32 is a sprocket 36 connected by a chain 38 with a sprocket 40 mounted on the outer 'end of shaft 3 of the roll 2. By this mechanism the doctor blade is reciprocated parallel to the axis of the roll 2 as the roll revolves, to improve its scraping action. The roll has a groove 50 to carry the adhesive, the form of which will nowbe described.

Figs. 3 and 4 show in detail one form of groove of the roll 2. In this form the outlines of the groove 50 are straight and parallel to the axis of the roll. Standing up from the bottom of the roove is a narrow rib 52, which undu ates from side to side of the groove. At all times while the groove is passing by the doctor blade the blade will be supported by the rib 52 and prevented from entering the groove and scooping 30 out the adhesive.

Where the machine is to be used for applying adhesive to paper for making paper bags which must be perfectly sealed, the undulations of the rib 52 should be proportioned with reference to 5 the longitudinal lines on which the paper is to be folded so that a full body of adhesive will come opposite the point where the rib 52 meets the side of the groove 50. For instance, if one longitudinal fold of the paper is along the line 40 opposite the section line 4-4, the part of the paper which passes over the point 5| will overlie the part which passes the point 53, where the rib 52 meets the side of the groove 50. Thus the thin gap left in the adhesive by the rib 52 5 will be filled in throughout its length by the adhesive onthe opposite part of the paper.

Fig. 5 shows a somewhat different and preferred modification of the'groove 50a, which in this case is of sinuous shape. The relation of the doctor 50 blade to the groove is indicated at III by dot and dash lines in Fig. 5. The lobes 55 of the cylindrical .surfaceof the roll interpenetrate sufficiently to provide a support for the doctor blade throughout the time when the groove is passing it. For this purpose the lobes 5| reach slightly past. the median line of the narrow zone indicated by dotted lines 56 within which the groove is confined. In this case the fold of the paper should be along the line opposite the section line 6-4, so that the undulations of the strip of adhesive will coincide when the paper is folded over.-

Figs. 7, 8 and 9 show several other shapes of groove, all characterized by interpenetrating lobes or projections of the cylindrical surface of the roll extending slightly past the median line of the zone within which the groove is confined.

All of the figures illustrate the principal fea ture of the invention which is that the doctor blade, while extending in the same general direction with the groove, is prevented from entering the groove by proper configuration of the mutually contacting surfaces of the blade and roll.

I claim:

1. In a device for laying transverse strips of adhesive on a travelling sheet of paper, a rotary cylindrical roll, a doctor blade contacting said roll, and means for applying adhesive to said roll, the periphery of said roll being indented to form a long continuous groove extending generally in a direction parallel to the axis of the roll, the groove areas and the cylindrical areas of the roll in the groove zone interpenetrating sufliciently to provide cylindrical supporting surfaces for the doctor blade efiective throughout the travel of the groove areas past the doctor blade.

2. In a device for laying transverse strips of adhesive on a travelling sheet of paper, a rotary cylindrical roll, a doctor blade contacting said roll, and means for applying adhesive to said roll, said roll being indented within a long narrow zone parallel to its axis to form a continuous extended groove, the cylindrical surface of said roll having portions protruding into said groove zone from both sides in alternation at least approximately as far as the median line thereof, to provide constant support for said doctor blade as the groove passes it.

3. In a-devic'e for laying transverse strips of adhesive on a travelling sheet of paper, a rotary cylindrical roll, a doctor blade contacting said roll, and means for applying adhesive to roll, the periphery of said roll being indented to form a substantially continuous tortuous groove the undulations of which are of an amplitude at least approximately as great as the width of the groove.

4. In a device for laying transverse strips of adhesive on a travelling sheet of paper, a rotary cylindrical roll, a doctor blade contacting said roll, and means for applying adhesive to said roll, said roll being indented to form a groove parallel to the axis of the roll, said groove containing a rigid narrow rib undulating from one side of the groove to the other, the edge of said rib being curved to conform to the cylindrical curvature of the roll.

5. In a device for laying transverse strips of adhesive on a travelling sheet of paper for making paper bags, a rotary cylindrical roll, a doctor blade contacting said roll, and means for applying adhesive to said roll, the periphery of said roll being indented to form a substantially continuous tortuous groove of regular design to carry a ribbon of adhesive past said doctor blade, the design of said groove being proportioned with reference to the lines on which the paper is to be folded to make the bags so that the tortuous ribbons of adhesive laid upon parts of said paper to be folded over will coincide with similarribbons of adhesive on the opposed portions of the paper.

'6. In a device for laying transverse strips of adhesive on a travelling sheet of paper for making paper bags, a rotary cylindrical roll, a doctor blade contacting said roll, and means for apply ing adhesive to said roll, the periphery of said roll being indented to form a groove parallel to the axis of the roll, said groove containing a rigid narrow rib undulating from one side of the groove to the other, the edge of said rib being curved to conform to the cylindrical curvature of the roll, the undulations of said rib being so proportioned with reference to the lines on which the paper is to be folded to make the bag that said lines cross said ,rib at points displaced from the peaks of the undulations.

CHARLES T. HAYES. 

